Abstract: An antenna coil includes a bar-shaped core, a bobbin, a coil, a case, and a wiring harness. The bobbin is formed of insulating material and has the coil wound around the bobbin with the bar-shaped core within the bobbin. The case is formed of insulating material defining a cavity having a cavity interior wall. The bobbin with the coil wound therearound is disposed in the cavity. The case has a protrusion extending into the cavity. The wiring harness is connected to the coil and disposed around a portion of a perimeter of the protrusion in a substantially omega shape and is disposed at least in part between the protrusion and the cavity interior wall. A flexible resin fills spaces in the cavity between the bobbin and the cavity interior wall.

Abstract: To provide an antenna coil, which is used to attach on a doorknob, door mirror and in particular on a handle and the like as a keyless entry device for a vehicle, which is simple in structure, cheap and miniature type with reliability on external connection and the like, in order to satisfy requirements for improvement of the reliability on external connection, miniaturization and environmental performances for shock, vibration, temperature and humidity. The antenna coil is provided with a thin bar-shaped core, a flat, recessed and insulated bobbin of which one side is open, and an insulated exterior case, with a recessed cross section on one side which is bigger than the bobbin and is open, stores the core in a recessed part of the bobbin, is provided with coil (lead) in which winding is provided on the winding groove formed in bobbin, stores coil in recessed part of exterior case and fills adhesive made of resin with high flexibility.